A kind of heat insulation polyester film for window film and preparation method thereof

Abstract

The invention discloses a thermal-insulation polyester film for window films. The thermal-insulation polyester film is an ABA type three-layer structure film, wherein the core layer is a transparent or colored layer, thermal-insulation layers are arranged on both sides of the core layer, the raw materials of the core layer comprise, by mass, 0-15% of color masterbatch and 85-100% of an optical-grade PET slice, and the raw materials of the thermal-insulation layer comprise, by weight, 3-39% of infrared absorption masterbatch and 61-97% of an optical-grade PET slice. According to the present invention, the polyester film is prepared by using three-layer co-extrusion biaxial stretching equipment, such that the thermal-insulation function of the window film and the synchronous preparation of the base film are achieved in the case of the avoiding of VOC, significantly-increased production energy consumption or increased production steps so as to reduce the production steps of the finished product window film, achieve the environmental protection, achieve the simple production process, and provide excellent heat insulation effect.

Description

technical field [0001] The invention relates to the field of polyester films, in particular to a heat-insulating polyester film for window films and a preparation method thereof. [0002] technical background [0003] Polyester film is already well known in the art as the base film of window film, and the polyester film as base material has good impact resistance, and except base effect, mainly plays the effect of safety explosion-proof to glass window, and window film such as Functions such as heat insulation, UV protection, and scratch resistance are all realized on the basis of polyester film through coating, magnetron sputtering, or lamination. Patent CN201410388933.2 discloses a UV-blocking window film, which is achieved by coating a mixture of UV absorbers, acrylic adhesives, curing agents and solvents on the surface of polyester or polyethylene film substrates and curing UV blocking effect, this preparation method cannot avoid the generation of volatile organic compou...

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Problems solved by technology

Patent CN201410388933.2 discloses a UV-blocking window film, which is achieved by coating a mixture of UV absorbers, acrylic adhesives, curing agents and solvents on the surface of polyester or polyethylene film substrates and curing UV blocking effect, this preparation method cannot avoid the generation of volatile organic compounds (VOC)

Patent CN201510190228.6 discloses a transparent heat-insulating window film. The window film uses water-based paint instead of oil-based paint to achieve heat-insulating effect, thereby avoiding the generation of VOC to achieve the purpose of environmental protection, but the production process requires a long drying time. Drying time is required to ensure that the membrane surface is fully dry, and the boiling point of water is higher than that of ordinary organic solvents, resulting in a significant increase in production energy consumption

Patent CN201410629081.1 discloses a core functional layer of a window film and a method for preparing the core functional layer of the window film. The method is to sequentially deposit corresponding functional layers on a PET base film by six-step magnetron sputtering. The disadvantages are The preparation process is complex and the product cost is high

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